<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Bootstrap环境搭建模板</title>
    <link rel="stylesheet" href="./bootstrap-3.4.1-dist/css/bootstrap.css">
    <script src="./bootstrap-3.4.1-dist/js/jQuery1.12.4.js"></script>
    <script src="./bootstrap-3.4.1-dist/js/bootstrap.js"></script>
</head>
<body>
    <style>
        div[class^=col-md]{
            border: 1px solid blue;
        }
    </style>
    <div class="container">
        <div class="row">
            <div class="col-md-1">.col-md-4</div>
            <div class="col-md-1">.col-md-4</div>
            
            <div class="col-md-1">.col-md-4</div>
            <div class="col-md-1">.col-md-4</div>
            <div class="col-md-1">.col-md-4</div>
            <div class="col-md-1">.col-md-4</div>
            <div class="col-md-1">.col-md-4</div>
            <div class="col-md-1">.col-md-4</div>
            <div class="col-md-1">.col-md-4</div>
            <div class="col-md-1">.col-md-4</div>
            <div class="col-md-1">.col-md-4</div>
            <div class="col-md-1">.col-md-4</div>
        </div>
        <div class="row">
            <div class="col-md-8 ">.col-md-4 col-md-offset-4</div>
            <div class="col-md-2 ">.col-md-4 col-md-offset-4</div>
        </div>
        <div class="row">
            <div class="col-md-8 col-md-push-3 ">.col-md-4 col-md-offset-4</div>
            <div class="col-md-2 col-md-pull-8">.col-md-4 col-md-offset-4</div>
        </div>
    </div>
</body>
</html>